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36results about How to "Increased power transfer capability" patented technology

Parameter tuning method of damping controller of wind farm side based on wide area measurement system signal

The invention discloses a parameter tuning method of a damping controller of a wind farm side based on a wide area measurement system signal, and can effectively inhibit the interval low-frequency oscillation in a system, improve a transmission capacity of a call wire, replace a traditional synchronous generator PSS (Power System Stabilizator) and improve the voltage control. The parameter tuning method comprises the following steps of: 1) adding an excitation signal at the input end of the system and carrying out signal collection at the output end for system identification; 2) utilizing a Prony analysis method to carry out identification on a power transmission system containing a double-fed wind electric field and determining an open-loop transfer function which is not introduced with an additional damping control; 3) on basis of the step 2), utilizing a retention index to select a feedback signal utilized by the additional damping control and a mounting position of the additional damping control; and 4) on basis of the steps 2) and 3), utilizing the open-loop transfer function of the system to tune phase compensation link parameters in an additional damping control link; and drawing a root locus picture of a closed-loop transfer function and determining a gain value K of an additional damping controller.
Owner:SHANDONG UNIV +3

Friction drive belt and method for producing same

The present invention relates to a friction transmission belt having a friction transmission part, in which the friction transmission part is formed of a rubber composition containing an ethylene-α-olefin elastomer, a mineral-based filler and a surfactant.
Owner:MITSUBOSHI BELTING LTD

Isolation type new energy power supply equipment based on three-port power converter

InactiveCN102751876ASmall rippleEasy to implement maximum power point tracking controlEfficient power electronics conversionDc-dc conversionCapacitanceSoft switching
The invention discloses isolation type new energy power supply equipment based on a three-port power converter. The isolation type new energy power supply equipment consists of a new energy battery, an energy storage device, an inverse resistance diode, two coupling inductors, four main switching tubes, two clamping switching tubes, two clamping capacitors, two rectifier diodes and two filter capacitors which are mutually connected. By adoption of a staggered parallel structure, the phases of the main switching tubes are controlled, and low ripples of the input current can be realized, so that the maximum power point tracking control of the new energy battery is easily realized; and meanwhile, by adoption of an active clamping structure, soft switching of the main switching tubes can be realized, so that the loss is reduced, and the efficiency is improved. In addition, by adoption of the series structure of two coupling inductors on the load side, high boosting capacity can be realized; the new energy battery can supply power to the load side and can supply power to a storage battery during operation; and when the new energy battery does not work, the new energy battery also can supply power to the load side through the storage battery.
Owner:ZHEJIANG UNIV

Non-contact power supply primary circuit with current expanding function

The invention relates to a non-contact power supply primary circuit with a current expanding function. The non-contact power supply primary circuit comprises an inverter and a primary coil, wherein a primary compensating circuit is connected between the inverter and the primary coil. The primary compensating circuit comprises a first inductor, a first capacitor and a second inductor, wherein one end of the first inductor is connected with the output anode end of the inverter, the other end of the first inductor is connected with one end of the first capacitor and a first end of the second inductor, a second end of the second inductor is connected with one end of the compensating circuit through the primary coil, and the other end of the compensating circuit is connected with the other end of the first capacitor and the output cathode end of the inverter. The compensating circuit compensates inductance in the primary coil, and a resonance circuit is formed between the compensating circuit and the primary coil to enable the first inductor, the first capacitor and the second inductor to form the circuit with the current expanding function. The non-contact power supply primary circuit with the current expanding function can achieve constant control of currents of primary cables, has the current expanding function and is wide in application range and safe and reliable.
Owner:MIRACLE AUTOMATION ENG CO LTD

Wind-power trend optimizing system based on fast energy storage and control method thereof

A wind-power trend optimizing system based on fast energy storage and a control method thereof belong to the technical field of wind-power power adjustment control in the new energy power generation technology. The wind-power trend optimizing system based on fast energy storage comprises a storage battery pack (1), a direct current power adjustment system (2), a super-capacitor group (3) and an alternating current and direct current power adjustment system (4). The direct current power adjustment system (2) adopts a plurality of groups of shunt-wound bidirectional Buck-Boost current transformation topologies, the storage battery pack (1) is located on the low voltage side of the direct current power adjustment system (2), the super-capacitor group (3) is located on the high voltage side of the direct current power adjustment system (2), and an energy storage link is connected with a public power grid through the alternating current and direct current power adjustment system (4). The control method of the wind-power trend optimizing system based on fast energy storage comprises an energy storage power distribution control method and a trend optimizing control method, and relates to an energy storage component charging state system on a chip (SOC) zone division method and dynamic adjustment rules of energy flow between the system and the power grid. The wind-power trend optimizing system based on fast energy storage and the control method thereof can improve power grid electric energy quality and stability and safety of the system.
Owner:SHANDONG UNIV OF TECH

Control method for maximum transmission power of hybrid double-feed-in direct current power transmission system

The invention provides a control method for maximum transmission power of a hybrid double-feed-in direct current power transmission system, which belongs to the field of hybrid direct current power transmission control of an electric power system. According to the method, firstly, a double-feed-in direct current power transmission system model is established, a per-unit value of the hybrid double-feed-in direct current power transmission system is selected and rated operating condition parameters are determined, and the model is solved. Through utilization of a linear relation between a voltage at an alternating current bus of a flexible direct current transmission VSC system and a current flowing from a VSC system converter station to the alternating current bus and equivalent impedance of a tradition direct current power transmission LCC side receiving end grid, two parameters are subjected to linear combination to obtain a virtual point voltage, and through fixed virtual point voltage control of a PI link, the VSC system automatically adjusts the output power for a change of the equivalent impedance of the LCC side receiving end grid, so that the hybrid double-feed-in direct current power transmission system outputs the maximum power under the strength of the receiving end grid. The method has the characteristics of reducing the control difficulty and improving the power transmission capability of the hybrid double-feed-in direct current power transmission system under the same strength of the receiving end grid.
Owner:TSINGHUA UNIV +2

Power transmission line utilization rate improving platform and method taking economic benefits and safety into integrated consideration

The invention relates to a power transmission line utilization rate improving platform taking economic benefits and safety into integrated consideration. The platform comprises a database module (1), an input module (2), an analysis evaluation module (3) and an output module (4) which are successively connected, wherein the input module (2) obtains a power transmission line initial load, trend distribution and power equipment data from the database module (1) for transmitting to the analysis evaluation module (3), the analysis evaluation module (3) gradually increases the load loaded by a power transmission line, when the load exceeds a safety value, calculates a safety economic cost paid by the power transmission line and economic benefits obtained by the power transmission line and compares increment speeds of the two, and the output module (4) outputs a power transmission line utilization rate at the moment. Compared to the prior art, the actual operation condition of the power transmission line is taken into full consideration, the calculation precision is high, and economic benefits of the power transmission line are improved.
Owner:CHINA ELECTRIC POWER RES INST +3

Online charging supplying device and method for patrol unmanned aerial vehicle

The embodiment of the invention discloses an online charging supplying device and method for a patrol unmanned aerial vehicle. The online charging supplying device comprises a control base station anda grouping control circuit, wherein the control base station is connected with an energy storage charging circuit through the grouping control circuit, and a push-pull inverter circuit, a full-bridgeuncontrollable rectifier circuit and a BUCK circuit are arranged in the energy storage charging circuit; and the output end of the push-pull inverter circuit is coupled with a first resonance coil through a transmitting coil, the first resonance coil is connected with a second resonance coil through magnetic coupling, and the second resonance coil is connected with the full-bridge uncontrollablerectifying circuit through a magnetic coupling receiving coil. According to the system, a dynamic tuning branch is adopted for compensating the change of the original-stage inherent resonant frequencyof the system, the resonance of the primary emission coil of the system is realized while the working frequency of the system is ensured to be constant, and therefore the power transmission capability of the whole coupling mechanism is improved; and the unmanned aerial vehicle can flexibly supply electric energy through the electromagnetic induction technology, so that the cruising ability of theunmanned aerial vehicle is improved.
Owner:GUANGDONG POWER GRID CO LTD +1

Magnetic circuit mechanism contactless power transmission device

The invention discloses a magnetic circuit mechanism contactless power transmission device, and relates to the technical field of contactless power transmission. A magnetic circuit mechanism primary side of the device is composed of a plurality of independent magnetic energy emission mechanisms connected in parallel. A magnetic circuit mechanism secondary side is composed of a plurality of independent magnetic energy pick-up mechanisms connected in series. The magnetic energy emission mechanisms are arranged on the running track of a locomotive, and the magnetic energy pick-up mechanisms are correspondingly installed at the bottom of the locomotive. The magnetic energy emission mechanisms and the magnetic energy pick-up mechanisms are of the same structure, and are composed of a receiving coil and a power conversion circuit. Each receiving coil includes at least two wound wire coils, each wire coil is connected with a rectifier module, and the rectifier modules output power. The device has the following advantages: the circuit topology is simple, and the power transmission ability of the system is strong; the magnetic cores of the pick-up mechanisms are not easy to saturate, and the pick-up mechanisms do not interfere with one another; the magnetic energy utilization rate of the primary side is high, and the system efficiency is high; and the device is suitable for providing high-power efficient energy transmission for a guide rail type contactless power transmission system.
Owner:XUZHOU UNIV OF TECH

Novel wireless power transmission system

The invention relates to a novel wireless power transmission system, which comprises a high-frequency AC power supply, a primary distributed magnetic circuit mechanism, a resonance compensation mechanism of the primary distributed magnetic circuit mechanism, a secondary distributed magnetic circuit mechanism, the resonance compensation mechanism of the secondary distributed magnetic circuit mechanism and a load, wherein a primary side of the system is formed by connecting a plurality of independent coils in parallel; a secondary side is formed by connecting the plurality of independent coils in series; and secondary coils are distributed at different positions of corresponding primary coils and obtain power from the corresponding primary coils for the load for use respectively. Compared with a traditional wireless power transmission system, the novel wireless power transmission system is high in power transfer capability; a magnetic core of the secondary magnetic circuit mechanism is not easily saturated; various secondary coils do not interfere with one another; the magnetic energy utilization rate of the primary side is high; and the system is relatively high in efficiency and is suitable for providing high-power efficient power transmission to a guide rail-type noncontact power transmission system.
Owner:CHINA UNIV OF MINING & TECH

Distributed type high-frequency conversion-based modular solid-state transformer and control method therefor

The invention discloses a distributed type high-frequency conversion-based modular solid-state transformer and a control method therefor. The modular solid-state transformer comprises multiple cascaded modules; each module comprises two sub converters SCi1 and SCi2, a high-frequency transformer and an auxiliary inductor L, wherein i represents the i module; each sub converter consists of four power sub modules; the structure of the power sub module can be a half-bridge type structure or a full-bridge type structure; each half-bridge type structure comprises a capacitor, two IGBTs and adiode in anti-parallel connection with the IGBTs; each full-bridge type structure comprises a capacitor, four IGBTs and a diode in anti-parallel connection with the IGBTs; the input end of the transformer is in a high voltage; multiple modules are connected in series to be used as the input end; the output end of the transformer is in a low voltage; and multiple modules are connected in parallel to be used as the output end. By controlling the output voltage V<hi1> of the SCi1 and the output voltage V<hi2> of the SCi2, the flowing direction of the current i<hi1> can be controlled, and equivalently, power flowing direction control is realized, and voltage conversion and isolation are completed.
Owner:HUNAN UNIV

Electric energy router networking-based power routing method and device

The invention discloses an electric energy router networking-based power routing method and device. The method includes the following steps that: the weight of each line is obtained according to a loss increase quantity generated by transmission target power, and paths enabling minimum loss between loads and a power source are calculated through a shortest path algorithm; the load nodes in a powergrid are sorted from large to small, power supplies and transmission paths which enable minimum loss are searched out from all the loads through a path search method, and the power supply output distribution and power transmission path distribution of the entire network can be formed; the power flow distribution of the entire network is obtained according to a whole-network power routing method,day-ahead predictive load and the output of a renewable distributed power source; and power transmission paths are adjusted according to difference values, so that power real-time balance required bythe power grid can be met. The method directly routes power without relying on an energy storage unit, and the power transmission capability of the power grid can be improved, and maximum voltage offset in the network can be reduced. Compared with other path selection methods, the strategy is adopted in a routing process enables low loss.
Owner:TSINGHUA UNIV

Lubricants for power transmission

ActiveUS20070037716A1High power transmission performanceHigh safetyOrganic chemistryAdditivesPower transmissionCarbon atom
There is provided lubricants for power transmission which exhibit not only a high coefficient of traction but also a high flash point. The lubricants for power transmission according to the present invention contains an alicyclic alcohol carboxylic diester compound represented by the general formula (1): R1—CO—O—(X1)m-Z-(X2)n—O—CO—R2   (1) wherein Z is a cycloalkylene group having 3 to 12 carbon atoms; R1 and R2 are each independently a chain hydrocarbon group having 3 to 20 carbon atoms; X1 and X2 are each independently a linear or branched alkylene group having 1 to 5 carbon atoms; and m and n are respectively an integer of 0 or 1.
Owner:IDEMITSU KOSAN CO LTD

Contactless transformer

The invention discloses a contactless transformer, which comprises a primary-side magnetic core, a primary-side winding, a secondary-side magnetic core and a secondary-side winding, wherein the secondary-side winding of the contactless transformer comprises a main secondary-side winding and an auxiliary winding; the auxiliary winding is of a two-section type or a multi-section type; each section of the auxiliary winding is overlapped, partially overlapped or not overlapped with the main secondary-side winding. According to the contactless transformer, each section of the auxiliary winding is distributed in different areas of the secondary-side magnetic core of the contactless transformer to form one, two or more auxiliary winding units, and the auxiliary winding units with optimal magnetic flux coupling effects are automatically switched under the conditions of dislocation in different directions and different degrees, so that the condition of no power transmission at a sending blind spot is further avoided by the combined output of each auxiliary winding unit and the main secondary-side winding, the power transmission of the main secondary-side winding is effectively compensated, the dislocation sensitivity of output characteristics of the contactless transformer is reduced, and the power transmission capability of the contactless transformer is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Control method and system for improving power transmission limit of doubly-fed fan under weak power grid

The invention discloses a control method and system for improving a power transmission limit of a doubly-fed fan under a weak power grid. The method comprises the steps that port voltage signals of the doubly-fed fan are collected in real time, reactive power reference signals needed for maintaining a constant grid-connected point voltage are obtained through an upper-layer voltage controller, andthen the reactive power reference signals of a stator side and a rotor side are obtained through a reactive power distributor; rotor-side and grid-side reactive controllers generate current referencesignals of rotor-side and grid-side current controllers according to a reactive instruction, and the current reference signals pass through the rotor-side and grid-side current amplitude limiting links to obtain reference signals actually input into the current controllers; the current controller outputs voltage modulation signals required by the rotor converter and the grid-side converter according to the current reference signals; and the converter is controlled to output active power and reactive power to the power grid so that a capacity of the converter is fully utilized, a fan power transmission capacity limit under the weak power grid is effectively improved, and the power transmission stability of the converter after saturation is considered.
Owner:HUAZHONG UNIV OF SCI & TECH +1

High-density PCB high-efficiently suppressing edge radiation and method for suppressing edge radiation

The invention relates to a high-density PCB high-efficiently suppressing edge radiation and a method for suppressing edge radiation. The EMI of the PCB mainly derives from a power distribution network. A power / ground plane in the power distribution network forms a resonant cavity which may cause serious electromagnetic radiation at resonant frequency. The high-density PCB and the method for suppressing edge radiation may high-efficiently shield the electromagnetic radiation in the power / ground and reduce the EMI to an ideal state. A laminate is an embedded planar capacitor laminate. The embedded planar capacitor formed by a thin dielectric and power ground plane pair can be viewed as AC short circuit at a high frequency band and may achieve a very good electromagnetic radiation suppression effect.
Owner:SYSU CMU SHUNDE INT JOINT RES INST +1

Magnetic resonant electric vehicle wireless charging integrated device and control method thereof

The invention relates to a magnetic resonant electric vehicle wireless charging integrated device. The electric vehicle wireless charging integrated device comprises a power transmitting device and apower receiving device, wherein the power transmitting device is arranged on the ground or below the ground, the power receiving device is arranged on a vehicle chassis, and is located above the powertransferring device during charging; and resonant circuits are used, the magnetic field coupling is maximized, the highest power transmission capability is generated at the resonant frequency, and meanwhile, the electric vehicle wireless charging integrated device has certain anti-deviation capability. The invention further provides a foreign object detection method and a charging control methodof the magnetic resonant electric vehicle wireless charging integrated device, rapid charging can be achieved, and metal foreign objects which affect the charging effect and exist between the power transmitting device and the power receiving device can be detected.
Owner:JILIN UNIV

Full-half bridge resonant converter and voltage balance control method thereof

The invention discloses a full-and-half-bridge resonant converter and a voltage balance control method thereof, a primary side of the full-and-half-bridge resonant converter is a full bridge and is provided with four switching tubes and a resonant inductor and a capacitor, a secondary side of the full-and-half-bridge resonant converter is a half bridge and is provided with two switching tubes, the full-and-half-bridge resonant converter is provided with six switching tubes, and compared with an existing double-bridge resonant converter, the full-and-half-bridge resonant converter has the advantage that the number of elements is reduced. A fundamental wave approximation method is adopted to analyze a power model and a soft switching condition, and a voltage balance control strategy is provided, so that the converter can realize voltage balance of a primary side and a secondary side in a wide voltage range, soft switching of all switching tubes is ensured, and the efficiency of the converter is improved.
Owner:CHANGSHU INSTITUTE OF TECHNOLOGY

A non-contact transformer

The invention discloses a contactless transformer, which comprises a primary-side magnetic core, a primary-side winding, a secondary-side magnetic core and a secondary-side winding, wherein the secondary-side winding of the contactless transformer comprises a main secondary-side winding and an auxiliary winding; the auxiliary winding is of a two-section type or a multi-section type; each section of the auxiliary winding is overlapped, partially overlapped or not overlapped with the main secondary-side winding. According to the contactless transformer, each section of the auxiliary winding is distributed in different areas of the secondary-side magnetic core of the contactless transformer to form one, two or more auxiliary winding units, and the auxiliary winding units with optimal magnetic flux coupling effects are automatically switched under the conditions of dislocation in different directions and different degrees, so that the condition of no power transmission at a sending blind spot is further avoided by the combined output of each auxiliary winding unit and the main secondary-side winding, the power transmission of the main secondary-side winding is effectively compensated, the dislocation sensitivity of output characteristics of the contactless transformer is reduced, and the power transmission capability of the contactless transformer is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

High-reliability and high-performance high-power plasma power supply

The invention provides a high-reliability and high-performance high-power plasma power supply, which comprises a computer total management system, a system controller, a power circuit, a high-power filter reactor and a high-frequency igniter which are connected together, wherein the computer total management system, the system controller and the power circuit form a hierarchical bionic control structure through a CAN network which has a synchronization and fault tolerance mechanism; the power circuit comprises an online work module and an online redundancy module; and the online work module comprises N groups of intelligent power modules with same structures, the online redundancy module comprises M groups of intelligent power modules with same structures, wherein N and M are natural numbers, and N is more than M. The high-reliability and high-performance high-power plasma power supply has the characteristics of higher reliability, better flexibility, energy and material saving, higher efficiency, good processing property, and the like, and is especially suitable for recycling of wastes of electronic wastes, solid wastes and the like, clean production of coal, metal smelting and machining, and the like.
Owner:SOUTH CHINA UNIV OF TECH

Non-contact power supply primary circuit with current expanding function

The invention relates to a non-contact power supply primary circuit with a current expanding function. The non-contact power supply primary circuit comprises an inverter and a primary coil, wherein a primary compensating circuit is connected between the inverter and the primary coil. The primary compensating circuit comprises a first inductor, a first capacitor and a second inductor, wherein one end of the first inductor is connected with the output anode end of the inverter, the other end of the first inductor is connected with one end of the first capacitor and a first end of the second inductor, a second end of the second inductor is connected with one end of the compensating circuit through the primary coil, and the other end of the compensating circuit is connected with the other end of the first capacitor and the output cathode end of the inverter. The compensating circuit compensates inductance in the primary coil, and a resonance circuit is formed between the compensating circuit and the primary coil to enable the first inductor, the first capacitor and the second inductor to form the circuit with the current expanding function. The non-contact power supply primary circuit with the current expanding function can achieve constant control of currents of primary cables, has the current expanding function and is wide in application range and safe and reliable.
Owner:MIRACLE AUTOMATION ENG CO LTD

Power supply device based on common-mode voltage of motor driving circuit

The invention discloses a power supply device based on common-mode voltage of a motor driving circuit.Factors influencing the loading capacity of the common-mode voltage are analyzed based on the idea of utilizing the energy of the common-mode voltage, a compensation capacitor is connected in series between a neutral point of a motor and a load, impedance matching is realized by the capacitor and an equivalent inductor in a loop, series resonance is generated, and the power transmission capability of the common-mode voltage to the load side can be effectively improved. Compared with a traditional processing mode of suppressing the common-mode voltage, the energy of the switching subharmonic at the neutral point of the motor, namely the energy of the common-mode voltage at the neutral point, is better utilized. Compared with a mode of directly using the common-mode voltage to supply power to the encoder, the power transmission capability of the common-mode voltage is improved, the problem of insufficient power of a common-mode power taking scheme is solved, and the common-mode voltage is enabled to be possible to supply power to a high-power load.
Owner:HUAZHONG UNIV OF SCI & TECH

Parameter tuning method of damping controller of wind farm side based on wide area measurement system signal

The invention discloses a parameter tuning method of a damping controller of a wind farm side based on a wide area measurement system signal, and can effectively inhibit the interval low-frequency oscillation in a system, improve a transmission capacity of a call wire, replace a traditional synchronous generator PSS (Power System Stabilizator) and improve the voltage control. The parameter tuning method comprises the following steps of: 1) adding an excitation signal at the input end of the system and carrying out signal collection at the output end for system identification; 2) utilizing a Prony analysis method to carry out identification on a power transmission system containing a double-fed wind electric field and determining an open-loop transfer function which is not introduced with an additional damping control; 3) on basis of the step 2), utilizing a retention index to select a feedback signal utilized by the additional damping control and a mounting position of the additional damping control; and 4) on basis of the steps 2) and 3), utilizing the open-loop transfer function of the system to tune phase compensation link parameters in an additional damping control link; and drawing a root locus picture of a closed-loop transfer function and determining a gain value K of an additional damping controller.
Owner:SHANDONG UNIV +3
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